USPS proposal requiring small parcel dimensions raises compliance fears

Data collection could add costs for small businesses that lack measurement technology

· Tuesday, January 20, 2026

The U.S. Postal Service wants shippers to submit dimensional data on all parcel shipments. Businesses would be hit with a penalty fee if the data isn’t accurate, according to a public notice. (Photo: USPS)

A U.S. Postal Service proposal to collect dimensional information for packages of all sizes, not just larger ones, is raising concerns that major shippers and small online sellers could be subject to non-compliance penalties, especially for non-standard parcels that are difficult to measure.

Under current rules, bulk shippers must list dimensions on the electronic manifest for boxes that exceed one cubic foot, or 22 inches in length. The dimensions, along with the weight, are plugged into a formula to determine the shipping price. Packages with measurements that differ from what USPS equipment measures are assessed a $1.50 surcharge. The Postal Service, according to a Jan. 8 notice in the Federal Register, now wants to collect dimensional information for every type of parcel moving as a manifest shipment, effective in mid-July.

The decision applies to Priority Mail Express, Priority Mail, Ground Advantage and Parcel Select products.

Smaller packages are currently charged by weight. The agency is not proposing to implement cubic volume charges on small pieces, but the data request raises questions for businesses about future intentions. And non-compliance fees could be another way to raise revenue.

“All of a sudden many more packages are going to have to be accompanied by this dimensional information. If you’re a shipper, that means you have more exposure to the possibility of having noncompliance surcharges,” said Michael Plunkett, president of the Association for Postal Commerce, in a phone interview. “Mid-July isn’t a whole lot of time for wholesale IT changes on the shipper’s side.”

The Association for Postal Commerce represents businesses and organizations that use the mail for business communication and commerce, as well as industry service providers.

Mailers and e-commerce shippers say there is a lot of uncertainty about what the Postal Service is trying to accomplish. Outstanding questions include what type of reconciliation process will be in place if the source of any inaccuracy is postal equipment itself. The deadline for filing comments about the proposed rule is Feb. 9.

A major concern is whether the proposed rule applies to goods in poly bags — polyethylene plastic bags that are lightweight, durable and cheaper to ship, but also shapeless.

“It is very difficult, if not impossible, to provide accurate information on poly bags and those are a substantial portion of low-weight and low-cubed shipments,” said Plunkett.

Smaller e-tailers who print labels from marketplaces or third party providers such as Amazon, Etsy or ShipStation will also be impacted by the changes, said Liz Morton, a long-time e-commerce professional who publishes articles about the industry on her own independent news site.

Instead of estimating the size of small, lightweight merchandise, sellers will have to add dimensional weight calculation technology or expect platforms to pass on the USPS non-compliance fees and possibly add an extra processing fee, she wrote this month.

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Eric Kulisch